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Injection molded WNiFe material and preparation method thereof

An injection molding and adhesive technology, applied in the field of materials, can solve the problems of increased manufacturing cost, low performance, waste of raw materials, etc., and achieve the effect of easy implementation and simple operation

Active Publication Date: 2018-04-13
四川有色金源粉冶材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the performance of the high specific gravity alloy prepared by the traditional molding process is low, and it is difficult to meet the current engineering application requirements.
[0004] The traditional compression molding process currently used can only meet the production requirements of simple shape parts (such as blocks, rods, etc.), and it is difficult to directly produce products with complex shapes and high precision requirements. If it is necessary to produce parts with complex shapes, further steps are required. Machining alloy billets increases manufacturing costs and wastes raw materials
At present, the price of high specific gravity alloy bars and blocks prepared by powder metallurgy in the market is between 300 yuan / kg-800 yuan / kg, and the cost of parts and components due to machining and material waste can increase by more than 30%.

Method used

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Examples

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Effect test

preparation example Construction

[0035] A method for preparing an injection-molded WNiFe material provided in an embodiment of the present invention includes:

[0036] S1. Melting Fe and Ni to obtain FeNi alloy liquid.

[0037] According to the preset ratio of Fe and Ni, Fe and Ni are smelted in a vacuum furnace to prepare FeNi alloy liquid.

[0038] Specifically, the above Fe and Ni are sintered and smelted in a vacuum furnace after being accurately weighed according to a preset ratio according to actual needs.

[0039] Further, the specific ratio of Fe and Ni can be selected to add a small amount of Co and other components according to actual needs.

[0040] Further, the smelting of Fe and Ni is carried out at 1000-1200°C.

[0041] When using a vacuum furnace to smelt the above-mentioned Fe and Ni, by controlling the sintering temperature, the comprehensive performance of the subsequent FeNi pre-alloyed powder can be further enhanced, and it is beneficial to the subsequent W powder and the FeNi pre-alloye...

Embodiment 1

[0073] The preparation method of an injection molding WNiFe material provided in this embodiment is obtained through the following steps:

[0074] Melt Fe and Ni in a vacuum furnace at 1000°C to obtain FeNi alloy liquid;

[0075] After the FeNi alloy liquid gas is sprayed with nitrogen gas, it is water-cooled to obtain FeNi pre-alloyed powder;

[0076] After mixing the FeNi pre-alloy powder and W powder, use a ball mill to mill for 10 hours, then add the binder solution and mix and granulate in the internal mixer at the same time. The mixing temperature is 150°C, and the mixing time is 2 hours. . After the above-mentioned granular materials are injection molded, they are vacuum degreased with nitrogen and then sintered at 1200°C.

[0077] Wherein, the adhesive in the adhesive solution is a mixture of paraffin, sulfamic acid, ethylene-vinyl acetate copolymer and rubber; the solvent is alcohol; the mass ratio of the adhesive to alcohol is 1:50. The addition amount of the bind...

Embodiment 2

[0080] The preparation method of an injection molding WNiFe material provided in this embodiment is obtained through the following steps:

[0081] Melt Fe and Ni in a vacuum furnace at 1200°C to obtain FeNi alloy liquid;

[0082] After the FeNi alloy liquid gas is sprayed with argon gas, it is water-cooled to obtain FeNi pre-alloyed powder;

[0083] After mixing the FeNi pre-alloyed powder and W powder, use a ball mill to mill for 24 hours, add the binder solution at the same time, mix and granulate in the internal mixer, the mixing temperature is 160°C, and the mixing time is 4 hours, and then extruded into granules . After the above-mentioned granular materials are injection molded, they are vacuum degreased with nitrogen and then sintered at 1300°C.

[0084] Wherein, the adhesive in the adhesive solution is a mixture of paraffin, sulfamic acid, ethylene-vinyl acetate copolymer and rubber; the solvent is gasoline; the mass ratio of the adhesive to gasoline is 3:50. The ad...

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Abstract

The invention relates to the field of materials, in particular to an injection molded WNiFe material and a preparation method thereof. According to the method, Fe and Ni are smelted to obtain FeNi alloy liquid; the FeNi alloy liquid is atomized, and then powder spraying is carried out to obtain FeNi pre-alloy powder; after the FeNi pre-alloy powder and W powder are mixed, an adhesive solution is added to carry out mixing pelleting, and a WNiFe material is obtained; and after the WNiFe material is molded in an injection manner, nitrogen is adopted to carry out vacuum carbon-free degreasing andsintering. The method is easy to operate and easy to achieve. The tensile strength sigmate b of a high-specific-gravity alloy product which is manufactured with the injection molded WNiFe material andprovided with a complex shape is larger than or equal to 500 MPa, the surface roughness Ra is smaller than or equal to 5 micrometers, the size precision reaches + / - 0.5%, the ductility eta is largerthan or equal to 10%, the hardness HRC is larger than or equal to 20, and the density K is larger than or equal to 97%.

Description

technical field [0001] The invention relates to the field of materials, in particular to an injection molding WNiFe material and a preparation method thereof. Background technique [0002] High specific gravity alloys have the advantages of high density, high strength and hardness, good thermal conductivity and weldability, good oxidation resistance, and small thermal expansion coefficient. They have been widely used in aerospace industry, national defense industry, and civil industry. It is used as counterweight and shock-absorbing material on gyro rotors and aircrafts, as armor-piercing projectile and submunition projectile material in the military field, and as a golf head counterweight in civilian use. [0003] The traditional powder metallurgy molding-sintering process is currently the main method for the production of high specific gravity alloy parts. Firstly, metal powders of tungsten, molybdenum, nickel, iron, and copper are mixed; then the mixture is put into a pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00B22F3/22C22C27/04
CPCC22C27/04B22F3/225B22F9/082B22F2998/10B22F2009/0872B22F1/10B22F1/103
Inventor 姚妮娜刘小凡周定杨高浩高世奎
Owner 四川有色金源粉冶材料有限公司